Three of the images are inspired by the Necker cube, a two-dimensional drawing of a cube that can be understood in two ways: either with the bottom left face at the front, or the top right face at the front. Once your eyes settle on one interpretation, it is hard to see the other.
13.徐旭（女） 长春中医药大学管理学院教师
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Уиткофф рассказал о хвастовстве Ирана своим ядерным потенциалом на переговорах08:47，更多细节参见heLLoword翻译官方下载
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